Issue - no library FS.h found when verifying

[Neoteb2]

Hello I have a Mac book with Arduino IDE and a pico board with a TFT 3.5. Trying to make a touch screen interface for a project. Have the core esp8266 installed through terminal into arduino ide folder. When I try to even verify regular example code that has in it #include <FS.h>. Gives me an error after trying to verify. I look tried multiple fixes that I could find and nothing works. Upon looking over the code I found the FS.h folder in the esp8266 and in there is FS_H defined and included could this be the problem. All I know I was trying to find the code example of the FS.h defined in any of the core codes and I don’t see it. So how will the computer find it when you implement the #include <FS.h>… also I did try the simple “” change instead of <> and still not found error.
Some assistance would be greatly appreciated. Thanks